Painting apparatus.



I. C. JOHNSTONE.

PAINTING APPARATUS.

APPLICATION FILED JUNE 17. 1916.

1,205,450. Patented Nov. 21, 1916 JOSEPH CLARK J'OHNSTONE, OF BUTTE, MONTANA.

PAINTING APPARATUS.

Specification of Letters Patent. Patented Nov, 21, 1916,

Application filed June 17, 1916. Serial No. 104,243.

To all whom it may concern:

Be it known thatI, JOSEPH CLARK J OHN- STONE, a citizen of'the United States of other liquid coating material upon surfaces.

One of the objects of the present lnvention is to provide a simple and practical apparatus of the above general character which will be inexpensive to manufacture.

Another object is to provide a painting apparatus which may be readily and conveniently cleaned.

A further object is to provide an apparatus of the first above mentioned character which. will maintain the liquid coating material in a desired and uniform state of consistency during operation.

Other objects will be in part obvious from the annexed drawings and in part indicated in connection therewith by the following analysis of this invention.

This invention accordingly consists in the features of construction, combination of parts and in the unique relations of the members and in the relative proportioning and disposition thereof; all as more completely outlined herein;

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the same by the numerous modifications in structure and relation contemplated by this invention, a drawing depicting preferred form has been annexed as a partof this disclosure, and in such drawing, is shown a single semidiagrammatic elevational view of the complete apparatus.

Referring now in detail to the drawing, 1 denotes a supporting framework such as a tripod which may be mounted upon a'portable platform if receptacle 2 in the form of an inverted truncated cone having an opening at the top in which a bushing 3 is adapted to fit and through which the receptacle may be filled with the coating material. This bushing 3 is provided with a stop cock or air vent valve 4 for the purpose of controlling the desired carrying .a main pressure of air within the receptacle. At the bottom of the receptacle is a pressure pipe 5 connected with a pump 6 which may be driven by a suitable motor 7 adapted to supply air under pressure to the receptacle. A check valve 8 is interposed in the pressure pipe to prevent a downward flow of the paint to the pump and a manually operated valve 10 will control the flow of air to the receptacle. This receptacle is preferably of the form shown and is substantially twice as wide at the top as at the bottom and about four times the height of the smaller base. It is filled about two-thirds full and the inflow of air will maintain a desired agitation of the liquid and prevent sediment or coloring pigments from collecting in the bottom thereof. The air cushion formed at the top on closing of the valve 1: will produce a uniform flow of the paint through the outlet pipe 11 at the base.

The pressure pipe 5 extends parallel to the pipe 11, as indicated at 12 and is provided with a connection 13 therewith having a valve 14; A valve 15 is also interposed between the receptacle and the connection of the pipes 11 and 13. These pipes 11 and 12 continue to a point free of the tripod where they connect with flexible tubing or hose 16 which in turn connect with a nozzle device which includes two branch pipes provided withvalves 17 and 18. The nozzle 20 may be of any desired shape adapted to spray surface to be coated. This construction permits the ready cleaning of the entire sys-v or direct the paint to the l tem as well as a proper regulation and mix- 7 ing of the; paint with air adjacent the point of delivery, thus a slow relatively o thick'stream may be discharged or a fine spray according to the pressure of air within the tank and adjacent the nozzle as indicated by gage 21.

The method of using a device of this character is substantially as follows: The valves 10, 14. and 15 are closed and the paint or coating material poured into the receptacle 1 r ask) 2 through the opening formed on removing the bushing 3. The air vent valve 4 is left open, the pump 6 started and valve 10 opened, permitting an inflow of air to the receptacle to cause a violent ebullition of the contents thereof thoroughly and uniformly to mix the same. After a few moments the air vent 4 is closed and the valve 15 opened which will permit a flew of paint to the nozzle attachment. The valves 17 and 18 are opened to the desired degree according to the nature of the stream of coating desired. Both of these valves may be closed, when it is desired to stop painting, and if the apparatus is to be left idle for any considerable length of time the vent 4t is partly opened to prevent a settling of the coating material in the bottom of the receptacle. At the end of the day when it is desired to suspend work, it is necessary to clean the pipes to prevent hardening of the coating material therein and this is done by closing the valves 10 and 15 and opening the valves 14 and 17 which will blow out all of the coating material in the pipes. At the completion of the job, it is desirable to clean the entire apparatus and this may be done by draining the tank or receptacle 2 and partially filling the same with gasolene or paint remover. By turning on the upper valve 10 at the bottom, the receptacle will be thoroughly washed and the contents pass out through the pipe 11.

From the above, it will be seen that the present device or apparatus provides a relatively simple and practical liquid coating machine which will be cheap to manufac ture, simple in construction and operation, and adapted to accomplish, among others, all of the objects and advantages herein set forth.

In the above description and following claims where the terms air and paint are used, these are to be interpreted in their broader aspect to include any source of gaseous pressure as well as any form of liquid coating material.

lVithout further analysis, the foregoing will so fully reveal the gist of this invention that others can by applying current knowledge readily adapt it for various applications without omitting certain features that,

from the standpoint of the prior art, fairly.

constitute essential characteristics of the generic or specific aspects of this invention, and therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalency .of the following claims.

I claim:

1. In an apparatus of the character de scribed, in combination, a receptacle having an inlet opening at the top provided with Copies of this patent may be obtained for five an air vent, a source of compressed air conscribed, in combination, a receptacle having an air vent at the upper part thereof, a

' source of compressed air connected with the lower part thereof, a check valve in the pipe leadlng from said source of compressed air,

a manually operated valve for controlling the flow of air to the receptacle, an outlet pipe and a valve in said outlet pipe, said outlet pipe being connected with said source of compressed air at a plurality of points 7 along its length.

3. In an apparatus of the character described, in combination, a receptacle of sub stantially inverted truncated conical form having an air vent at the upper part thereof,

an air inlet at the lower part, means for sup plying compressed air through said inlet, a check valve preventing a flow of the liquid contents of the receptacle to said sourceof compressed air, a nozzle, and valved connectio-ns between the nozzle and the receptacle with the source of compressed air for varying the nature of the stream.

4. In an apparatus of the character de-' scribed, in combination, a supporting frame,

a receptacle carried thereby of substantially inverted truncated conical form having an air vent at the upper part thereof and a valved inlet connected with the central part of the base, a source of compressed air leading to said inlet, an outlet pipe leading from the base of the receptacle, a nozzle flexibly connected with said outlet pipe and with said source of compressed air, valves asso-- ciated with the nozzle for varying the proportions of air and coating material and a valve connected between the outlet pipe and source of compressed air positioned between the receptacle and the nozzle. In testimony whereof I aflix my signature in the presence of two witnesses.

JOSEPH CLARK JOHNSTONE. \Vitnesses ALEX J. JOHNSTONE. E. J. BARKER,

cents each, by addressing the Commissioner of Patents,

. Washington, D. G. 

